OBD-II code · Powertrain (generic)
P0498 EVAP System Vent Valve Control Circuit Low
The vent valve closes the EVAP canister to atmosphere during leak tests. The control line for that valve is shorted to ground - the ECU drives the valve and measures voltage below the expected level, indicating either a harness short or an internal solenoid short.
Is it safe to drive with P0498?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyControl line shorted to ground
- PossibleVent solenoid internally shorted
- Less likelyConnector pins corroded - high contact resistance
Symptoms
- Check engine light on
- Possible smell of fuel near tank or engine bay
- Failed emissions inspection
- Loose-cap warning may appear
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.4–1.2 h
- Emissions test
- Likely to fail
- Parts involved
- Evap Vent Valve, Evap Vent Wiring
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.